今明午後雷雨,週四起新一波高溫來襲~2016/07/19 - 颱風討論

By Steve
at 2016-07-19T13:46
at 2016-07-19T13:46
Table of Contents
過去這兩天因為太平洋高氣壓減弱,各地午後對流發展較為旺盛,
雖然雷雨來得又急又猛讓人措手不及,但是卻也是很好的天然冷氣,
特別是對於台北盆地的朋友來說,
午後雷雨發生前的高溫都來到37度以上,特別是上週日(17日)還創下38.2度高溫,
這個西北雨的降溫還真是來得及時。
目前的預報看起來,今天到明天(19~20日)還有機會出現比較多的午後雷雨,
各地的朋友都要小心大雷雨可能帶來的劇烈雨勢,尤其是山區,
外出要記得攜帶雨具,並且避免前往危險區域。
預報資料顯示從週四(21日)起太平洋高壓將會再度增強,
而且高壓中心有機會直接來到台灣附近,
不僅是地面高壓中心,連高空的高壓中心也都靠近過來,
自下到上都是高氣壓影響,像一個大鍋蓋一樣籠罩台灣,
對流難以發展,午後雷雨的機會將會大幅度減少。
http://i.imgur.com/tSEqsiu.png
以台北為例,從台北上空的垂直相對濕度分布時序預測來看,
21日~23日台北上空相當乾淨,只剩下底層還有一些水氣(雲層),
雲層發展被高壓壓制的情況相當明顯,
http://i.imgur.com/IR6WkSE.png
雲層一少陽光就會很強,對地面的加熱效果很好,
加上台北有盆地聚熱以及都市熱島效應加乘成,
因此垂直溫度分布時序預測顯示在21~23日間
台北近地面(約100公尺高度)的溫度超過35度,
到達地面很可能就是36~37度的高溫,甚至不排除有機會再度挑戰38度大關,
提醒大台北的朋友在周四起,至少一連3天都要特別注意高溫拉警報的狀況發生。
http://i.imgur.com/JWy3JfD.png
其實不只是台北熱,其他地方的高溫在周四之後也都可能來到34~36度左右,
這種溫度已經很接近人體的體溫,因此不利於人體的自然散熱機制,
很容易熱累積在體內而造成體溫偏高,進而引發中暑甚至熱衰竭等熱傷害症狀,
所以溫度很高的時候要避免在戶外活動,
即使在室內也要拉下窗簾等阻擋輻射熱能,盡量降低室內的溫度,
不然即使在室內,也會有中暑的危險性。
以上簡單供參考囉~
--
雖然雷雨來得又急又猛讓人措手不及,但是卻也是很好的天然冷氣,
特別是對於台北盆地的朋友來說,
午後雷雨發生前的高溫都來到37度以上,特別是上週日(17日)還創下38.2度高溫,
這個西北雨的降溫還真是來得及時。
目前的預報看起來,今天到明天(19~20日)還有機會出現比較多的午後雷雨,
各地的朋友都要小心大雷雨可能帶來的劇烈雨勢,尤其是山區,
外出要記得攜帶雨具,並且避免前往危險區域。
預報資料顯示從週四(21日)起太平洋高壓將會再度增強,
而且高壓中心有機會直接來到台灣附近,
不僅是地面高壓中心,連高空的高壓中心也都靠近過來,
自下到上都是高氣壓影響,像一個大鍋蓋一樣籠罩台灣,
對流難以發展,午後雷雨的機會將會大幅度減少。
http://i.imgur.com/tSEqsiu.png

以台北為例,從台北上空的垂直相對濕度分布時序預測來看,
21日~23日台北上空相當乾淨,只剩下底層還有一些水氣(雲層),
雲層發展被高壓壓制的情況相當明顯,
http://i.imgur.com/IR6WkSE.png

雲層一少陽光就會很強,對地面的加熱效果很好,
加上台北有盆地聚熱以及都市熱島效應加乘成,
因此垂直溫度分布時序預測顯示在21~23日間
台北近地面(約100公尺高度)的溫度超過35度,
到達地面很可能就是36~37度的高溫,甚至不排除有機會再度挑戰38度大關,
提醒大台北的朋友在周四起,至少一連3天都要特別注意高溫拉警報的狀況發生。
http://i.imgur.com/JWy3JfD.png

其實不只是台北熱,其他地方的高溫在周四之後也都可能來到34~36度左右,
這種溫度已經很接近人體的體溫,因此不利於人體的自然散熱機制,
很容易熱累積在體內而造成體溫偏高,進而引發中暑甚至熱衰竭等熱傷害症狀,
所以溫度很高的時候要避免在戶外活動,
即使在室內也要拉下窗簾等阻擋輻射熱能,盡量降低室內的溫度,
不然即使在室內,也會有中暑的危險性。
以上簡單供參考囉~
--
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